Back on topic: Make cigs illegal!!!! 
Whoa there horsey!

Here are some figures for you all to digest. Should keep this thread going.

From a bit of research and figures from the Department of Health and Revenue and Customs.
Approx 80% of the UK population do not smoke.
So only 20% are smokers.
According to a written response from the DoH in 2009:
“smoking is the largest single cause of preventable illness and premature death in the UK. It kills 106,000 people every year and costs the British taxpayer more than £1.7billion a year in treatment bills alone. It causes 84 per cent of deaths from lung cancer and 83 per cent of deaths from chronic obstructive lung disease, including
bronchitis†2011/12 NHS budget is £106 Billion
Cost of treatment is £1.7 Billion
Tax revenue from tobacco 2010-11 is £11.1 Billion
Net GAIN = £9.4 Billion
Or to put it another way. If you banned smoking the Government would LOSE £11.1 Billion in spending but would gain only £1.7 Billion from not having to treat people.
But these people would now be living longer. So you would have to factor in their benefits/pensions, and offset this against any tax revenue they would generate by working etc..
It get complicated. But all in all probably wont amount to £11.1 Billion, or there about.
HTH
Jonathan.